For anyone buying or selling with a stranger

Paste the chat. Handshake checks it for scam tricks and real prices from 25,000 stores, lets AI agents negotiate a fair deal, and PayPal holds the money until the item really arrives.

Check a deal I'm sellingWatch how it works
“Send it Friends & Family, saves us both the fee”“I'm moving tomorrow, first to pay gets it”“I sent too much, refund me the difference”“Can you ship it to my cousin instead?”“Pay this invoice to unlock the listing”“Here's the payment screenshot”“Send it Friends & Family, saves us both the fee”“I'm moving tomorrow, first to pay gets it”“I sent too much, refund me the difference”“Can you ship it to my cousin instead?”“Pay this invoice to unlock the listing”“Here's the payment screenshot”

See how it works

Two and a half narrated minutes on the live site: AI stops a scam, then an honest deal goes from listing to payout, with PayPal holding the money until the item arrives.

Recorded on the live site · PayPal sandbox money, real API callsWatch on YouTube ↗

How it works

  1. Drop in the listing, the messages or a screenshot. We read it for the tricks scammers use: Friends & Family, fake urgency, overpayment, address swaps.

    AI · Vision

New · Agent negotiation

Set a secret max, and PayPal holds it so the seller knows you're serious. Your agent haggles with theirs using real market prices. Code makes sure neither one crosses a limit.

How the agents work

Agents negotiating

Example · Switch OLED · asking $230

Fair zone
Asking
$230Seller's agent
    Secret limits: buyer max $215 · seller floor $190. Neither side ever sees the other's.

    Under the hood

    Agents0times an agent crossed its owner's limit, across 327 automated tests and live prompt-injection runs.
    PayPal12PayPal calls take a deal from a signed-in seller to a paid one and a paid PayPal receipt, each run live on the sandbox.
    Channel325kstores priced live to catch bait, set a fair range and price damaged parts.
    Render8kinds of deadline enforced by a Render Workflow, each tested to fire exactly once, so no deal can stall.
    Kernel1pasted link is all a buyer needs: a Kernel cloud browser reads the listing and spots store photos.
    Elastic3ways scam memory recognizes a scam again: the same details, the same tactics, the same photo.

    Powered by PayPal.
    Built with the best.

    The tools behind every check, hold and payout

    • PayPal
    • Channel3
    • Kernel
    • Elastic
    • Claude
    • GPT
    • OpenRouter
    • Groq
    • EasyPost
    • Render
    • PostgreSQL
    • Next.js
    • React
    • TypeScript
    • Zod
    • Tailwind CSS
    • Motion

    The problem

    $15.9B

    lost to fraud by Americans in 2025, a record.

    Source: FTC

    #2

    most reported fraud in 2024: online shopping.

    Source: FTC, 2024 data

    0

    protection when you pay a stranger with Friends & Family.

    Source: PayPal

    Why it's safe

    PayPal holds it

    Your money sits in a PayPal authorization, not with us and not with the seller. If the deal falls apart, the hold is released and you pay nothing.

    Both people get a say

    For a damage claim, AI suggests a fair refund. Nothing is captured until you both accept, or neither of you declines within 3 days. A refund can never exceed what you paid.

    Prices are real

    Market prices and repair costs come from live listings across 25,000 retailers, so a refund is evidence, not a guess.

    Check it in 10 seconds